SHELL

bash commands in node

const { exec } = require('child_process');
exec('ls | grep js', (err, stdout, stderr) => {  
  if (err) {    
    //some err occurred    
    console.error(err)  
  } else {   
    // the *entire* stdout and stderr (buffered)   
    console.log(`stdout: ${stdout}`);   
    console.log(`stderr: ${stderr}`);  
  }
});

running shell commands nodejs

const exec = require('child_process').exec;
const child = exec('cat *.js bad_file | wc -l',
    (error, stdout, stderr) => {
        console.log(`stdout: ${stdout}`);
        console.log(`stderr: ${stderr}`);
        if (error !== null) {
            console.log(`exec error: ${error}`);
        }
});

running shell commands nodejs

const system = require('system-commands')

system('ls').then(output => {
    console.log(output)
}).catch(error => {
    console.error(error)
})

shell command using node

const exec  = require("child_process").exec;
exec("ls -la", function (error, stdout, stderr) {
    if (error) {
        console.log("Error: " + error);
        return;
    }
    if (stderr) {
        console.log("stderr: " + stderr);
        return;
    }
    console.log("stdout: " + stdout);
});